Respuesta :

Answer:  27

Step-by-step explanation:  Half of the supplementary (180 degree) angle is 90 degrees so we know that the other half is also 90 degrees.  so 3x+9=90

Subtract 9   3x=81 divide by 3

                      x=27

itsjustzim

Answer:

27

Step-by-step explanation:

Otras preguntas